Means of supporting movable elements of electrical instruments.



PATENTED SEPT. 19, 1905.

v E. HARTMANN. MEANS OF SUPPORTING MOVABLE ELEMENTS OF ELECTRICAL INSTRUMENTS.

APPLICATION FILED urns, 190a.

5 by the. clamps l l l l'.

UN [T ED ST arana orr on.

lCUHlCi llAR'lMANN, 0F FRANKFtlltT-ON-Tllit-MAIN, GERMANY, ASSlGNOR TO THE FIRM til llAli'lltlANN & BRAUN A. (l. FABRIK l lli il lt 'llltlSUHER MlCbblNS'lRlIMlCillC, OF FHANKFOltT-ON-THE-ZtlAIN, (lEltNiAlilY.

Specification of Letters Patent.

Patented fiept. 19, 1905.

Application filed January 3,1903. Serial No. 137.666.

To rr/Z e171 out if 71111 1, (once/'11.-

Be it known that 1, Enemy HAR'IMANN, professor, electrical engineer, residing at Obcre Kt'migstrasse 9, Franktort-on-the-lilain, German l lmpire, have invented new and useful improvements in Means of Supporting Nov 5 tection against trembling and jars, which areso detrimental to instruments the movable bodies of which are carried on points.

According-to the present invention the mov.

able body say the turning coil of an electrical nurasuring instrument is connected near its center to a wire or thread passing through the coil. The latter is provided with a tube encircling the sup;iorting-wire and carrying bearings or eyes. i

.In th! accompanyingdrawings, Figure 1 is an end view of an electrical instrument cmbodying my invention. Fig. 3 is a vertical section thereof on line 2 3 ol' Fig. 1. Fig. 3 is a horizontal section on line 3 3 of Fig. 1 3 looking upward. Fig. & is apcrspective view of the movable member of the instrument. Fig. 5 is a horizontal sect-ion substantially on line5 5 of Fig. at; and Fig. (3 is a vertical section of .the movable member, showing a slightly dili'crent construction,

As shown in l igs. l to 5, the coil or bobbin A is wound on a body or Frame-1i substantially ot' rectangularshape, which is connected with r a vertical tube (1. Near the center the tube 4 C is connected, as at li', with a wire or thread l), which is stretched between the clamps i 1 one of which also serves as a binding-post. The tubet conceiitrieally surrounds the supporting-wire 1 In both ends of the tube 4-5 bearin s or eves i are uovided throu 'h h I 7 h which the wire I passes. lhese bearings may be made ol" jewels titted to the supporting-wire l and form a frictionless guide. for the wire near the points at which it is secured The tube carrying the bearings and connected to the middle of the wire may be replaced with any suitable support of proper shape. With the tube is connected a pointer or other suitable indicator H. The clamps I E are secured to a suitable "frame carried by the magnet Lhaving pole-pieces I and also having a core-piece I", carried by bars I. The tube C extends loosely thrqpgh the said core-piece, as shown in Figs. 2 and 3. The frame B, with the coil A, swings in the space between the pole-pieces l and the core-piece I.

The current is supplied to the windings of the coil A at one end A through the tube C and the supporting-wire D and at the other end by means of a thin flexible mett l ribbon (l, the other end of which is connected to a binding-post J.

Instead of passing the tube (,1 through the frame B and connecting the wire .I) in the middle of the tube, as shown in Figs. 2 and 4, the tube may be interrupted, or composed of two short tubes C and respectively, each hav ng its separate wire D and D respectively, as shown in Fig. 6. These wires are not electrically connected with each other except through the medium of t the coil A, it being understood that one end of the coil is connected with the wire D, as by means 01 the tube while the other end of the coil is connected to the wire D, as through the medium of the tube 0'. The wires D l) are then connected with suitable terminals, which may be formed by the clamps E F.

In each of the constructions shown the movable member is nicely suspended for measuring purposes and will work reliably even when it is not in an exactly vertical position, and the entire system is protected against disturbing mechanical influences.

The torsion power of the stretched supporting wirc may be used as directing or counter power. it this is not sutiicicnt, cylindrical or 'tiat coiled spiral springs may be arranged, either single or double acting.

Now what i claim, and desire to secure by Letters Patent, is the following:

'1. In an electri *al instrument, a movable coil, wire secured to the coil and also to a stationary support, and bearings secured to the coil and located adjacent to the stationary ends of said wire, and surroumling the latter.

2. A movable body fastened to stretched wire and bearings through which said wire passes substantially as described.

3. in an electrical instrument the combination with a movable coil of stretched 'wire on which the coil is fastened and which passes through bearings near'the fixed or stationary ends of said WlI'O' substantially as described.

4. ln an electrical instrument he combination with a movable coil of stretched wire on which the coil is fastened and which is passed through bearings supported on the body of the coil substantially as described.

In an electrical instrument,a movable scribing witnesses. L

tion with a movable coil of a stretched wire composed of two pieces of wire connected respectively with the ends of said coil but otherwise electrically insulated from each other and hearings on the COll and encircling the wires near their outer ends substantially,

as described.

8 In an electrical instrument, a movable coil with projecting. tube portions having bearings adjacent to their outer ends,. and wire-secured to said cell and to a stationary support and extending through said tube portions and bearings.

In testimony whereof I have signed my name to this specification in the presence of two sub- EUGEN' lIAltTMANN.

Witnesses:

ROBERT BijuL, JEAN GRUND. 

